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岩石倾斜平面结构特别适用于确定孔内岩心的指北方向和深度。本文提出了一种数学方法,能够使岩心段的平面(表面)结构和孔壁图像的正弦曲线状结构达到最佳的叠合。这里所说的孔壁图像是专门由岩层显微扫描仪(FMS)和孔底电视(BHTV)测定的。两种测井工具可提供电的或声的图像,并且计算出工具的磁北方向。将岩心与测井记录对比之后,就会知道岩心的指北方向。此处阐述的方法是以匹配单个结构的倾角、方位和深度三个参数为基础。借助于监测器的电子计算机,或利用纸带打印输出的图像透明片,可以在孔壁图像上检测出上述三个参数。运用本文介绍的CREOS计算机程序时,在预定要查找的孔壁图像段,按选定的长度间隔,让岩心通过一切可能的位置。在测量精度范围内匹配最好的位置就是岩心结构与测井记录结构叠合最佳的位置。另外,判断叠合最佳的准则是岩心与测井记录上用于相互匹配的平面结构的全部标准离差之和。相互匹配的两结构,其标准离差是按照岩心和测井记录上平面状结构的三个无量纲、归一化的参数离差的平方计算的。归一化处理是利用测井记录或岩心资料能够确定的误差进行的。此处介绍的方法已经成功地试用于有干扰的综合数据的处理,以及德国大陆科学深钻计划(KTB)先导孔的岩心和测井资料的处理。该方法与用定向岩心以及与用人工叠合岩心结构和测井记录结构得到的结果相比,有很好的一致性,而且叠合时间也显著减少。
The rock dip plane structure is particularly suitable for determining the northing direction and depth of the core in the hole. In this paper, a mathematical method is proposed to achieve the best superposition of the planar (surface) structure of a core segment and the sinusoidal structure of a hole wall image. Hole wall images referred to here are those specifically made by Rockwell Microscopy Scanners (FMS) and Bottom Hole Television (BHTV). Both logging tools provide an electrical or acoustic image and calculate the tool’s north-to-north direction. After comparing the core with the well log, you know the northing direction of the core. The method described here is based on three parameters that match the inclination, orientation and depth of a single structure. With the help of a monitor computer or an image transparency printed out with tape, the above three parameters can be detected on the hole wall image. When using the CREOS computer program described in this article, at a predetermined length of the hole in the image of the hole wall to be found, let the core pass through every possible position. Matching the best position within the measurement accuracy is the best place to stack core and logging structures. In addition, the best criterion for determining the overlap is the sum of all the standard deviations of the planar structure used in the core and well log for matching each other. The two structures that match each other have their standard deviation calculated as the square of the three dimensionless, normalized parameter deviations of the planar structure on the core and log. Normalization is done using well-established logs or core data. The method presented here has been successfully tested for the processing of disruptive integrated data and for core and well logging data from the KTB pilot hole. This method is in good agreement with the results obtained with directional cores and with artificially superimposed core structures and well log structures, and the lamination time is also significantly reduced.